I too have been a bit confused.
What someone paid for something X years ago has absolutely nothing to do with what it should sell for now. So if someone paid say $400 for a mill and used it in hobby conditions maybe 25 times so it still in effect looks brand new what's to say the resale value isn't $400 less than a new one for $2400? Not everyone has that extra $400 that could be spent on tooling.
What about the mill bought say N years ago for $3399 (just shy of $3400). If the only thing available even close in size and mass is now $9000 what's a reasonable resale value? Now if it's been upgraded to ball screws and CNC and the closest similar in mass/size system is $20K what's a reasonable resale value?
Unlikely a hobby type will buy it. But then also unlikely a hobby type will buy one of these either.
KENT USA,KTM3VKF 3-AXIS MILL.MACH W/ACURITE CONT,6-273-011,KBC Tools & Machinery
www.kbctools.ca